Patents by Inventor Ewald Hohm

Ewald Hohm has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Linear polyurethane ultrafilter and processes for use thereof
    Patent number: 4332686
    Abstract: An ultrafiltration membrane comprised of a linear polyurethane having a hydraulic permeability for water of about 50 to 500 1/m.sup.2 .multidot. h and a separation factor .alpha. of about 2.times.10.sup.-3 to 1.times.10.sup.-4, the permeability being based on determination with a membrane of a thickness of about 0.02 mm, a pressure differential of 1 bar and a temperature of 20.degree. C. and the separation factor .alpha. being established with a 2% oil-water emulsion at 25.degree. C. The membrane is particularly suited for operation of oil-water mixtures or emulsions.
    Type: Grant
    Filed: April 30, 1980
    Date of Patent: June 1, 1982
    Assignee: Akzo N.V.
    Inventors: Klaus Gerlach, Joachim Behnke, Wolfgang Rosener, Ewald Hohm